I don't really think they will get rid of them...they have too much functionality at other Disney places...I just don't think they will expand that functionality at
Disneyland beyond what it already is, therefore, if they needed the bands for the cruise ships, off they would go.
I don't know if they still offer it but when DH and I went to WDW a couple of years ago, they offered us our pick of bands in the package we purchased. Clearly, they want you to use them fully there.
Personally, I just like when they light up for certain things...and tapping inis so much faster...